[Oscar-users] MPI ranking and size problem

[Michelle Chu]

Hello, there,

When I mpirun a simple hello MPI program on all my eight nodes as the following. I get a sequence of hello world! i am 0 of 1, instead of 1 of 8, 2 of 8, 3 of 8. Also, problem with MPI_INIT. Thank you for your help.

which mpicc
/opt/lam-7.0.6/bin/mpicc
lamboot -v my_hostfile
my_hostfile is:
**************************************
athena.cs.xxx.edu
oscarnode1.cs.xxx.edu
oscarnode2.cs.xxx.edu
oscarnode3.cs.xxx.edu
oscarnode4.cs.xxx.edu
oscarnode5.cs.xxx.edu
oscarnode6.cs.xxx.edu
oscarnode7.cs.xxx.edu
oscarnode8.cs.xxx.edu

*****************************************************************************
LAM 7.0.6/MPI 2 C++/ROMIO - Indiana University

n-1<16365> ssi:boot:base:linear: booting n0 (athena.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: booting n1 (oscarnode1.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: booting n2 (oscarnode2.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: booting n3 (oscarnode3.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: booting n4 (oscarnode4.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: booting n5 (oscarnode5.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: booting n6 (oscarnode6.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: booting n7 (oscarnode7.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: booting n8 (oscarnode8.cs.xxx.edu)
n-1<16365> ssi:boot:base:linear: finished

mpirun N hello++
*****************************************************************
Hello World! I am 0 of 1
Hello World! I am 0 of 1
Hello World! I am 0 of 1
Hello World! I am 0 of 1
Hello World! I am 0 of 1
Hello World! I am 0 of 1
-----------------------------------------------------------------------------
It seems that [at least] one of the processes that was started with
mpirun did not invoke MPI_INIT before quitting (it is possible that
more than one process did not invoke MPI_INIT -- mpirun was only
notified of the first one, which was on node n0).

mpirun can *only* be used with MPI programs (i.e., programs that
invoke MPI_INIT and MPI_FINALIZE).  You can use the "lamexec" program
to run non-MPI programs over the lambooted nodes.
-----------------------------------------------------------------------------
Hello World! I am 0 of 1
****************************************************************************************************